Malicious PDF — malware analysis report

Static analysis result for SHA-256 5856bfb17681dce3…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 20:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b72a39b44d739ae0edb2cc5db1d6f51e SHA-1: 0ba79b4bdb67a786c61fb4ce433c31088a74e69c SHA-256: 5856bfb17681dce3eed39ea6b042aa92287ee1bfc92fd3b6ff732072de25fd70
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript and multiple external URIs, some pointing to raw IP addresses and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://chretkinia.pl/userfiles/file/33612919332.pdf
    • http://jdjcnc.com/upfolder/e/files/20210906110217.pdf
    • http://morakothotel.com/file_media/file_image/file/40166338476.pdf
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906202253858475.pdf
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/39832272368.pdf
    • http://pitin-akutsu.com/js/upload/files/turasatori.pdf
    • http://185.33.116.145/~acus01/upload/files/nodonuxuvanazafokezo.pdf
    • http://fitsiluet.cz/data/file/6184794536.pdf
    • https://hinaweb.com/upload/file/komemizowoxibijula.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ada37a4e3e234e780739f2b2ebb1c79a/vuwirijozixuwewikexetejuw.pdf
    • http://prograsifkalip.com/files/81020617902.pdf
    • https://adsbudget.net/userfiles/file/nunumugaxevose.pdf
    • http://gro-felix.si/uploads/61251069424.pdf
    • http://wixoon.hu/upload/file/wefij.pdf
    • https://bywuf.org/upload/editor/files/6857117017.pdf
    • https://systematix.pl/userfiles/file/xotixekalusewarimez.pdf
    • https://fajndoktor.cz/images/file/files/89689207867.pdf
    • http://www.nomorcantikjoss.com/file/tejufudoxefanegesumubijim.pdf
    • https://goodline.by/userfiles/file/851335416.pdf
    • http://jamxmpharmatech.com/upload/files/661833923.pdf
    • http://hwayinn.com/image/files/20210909_065445.pdf
    • http://bobiniauto.com/userfiles/file/gaxulitezemo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=i+will+be+here+worshipping+by+dunsin+oyekan
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c73f.bin
6d17bac51b3e1e81ce18ef1a46b90551ee8a65a357c39acf7ddbc160d2bcaa9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC73F 18836 bytes
font_01_sfnt_off0000f844.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 16792 bytes
font_02_sfnt_off0001105b.bin
918b4d6fa4fefed09fa2ae7afa36708ad28dfceecbd3ca064efffae7d7c58e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1105B 11056 bytes

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